# air

> homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances; gas mixture present in the Earth's atmosphere

**Wikidata**: [Q7391292](https://www.wikidata.org/wiki/Q7391292)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Air)  
**Source**: https://4ort.xyz/entity/air


## References

1. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=21354)
2. [The New Book of Knowledge: The Children’s Encyclopedia. Grolier. 1970](https://library.unimed.ac.id/index.php?p=show_detail&id=32810&keywords=)
3. Nuovo soggettario
4. [Registros de autoridad de "Materia" de la Biblioteca Nacional de España. Spain open data portal](https://www.bne.es/media/datosgob/catalogo-autoridades/materia/materia-UTF8.zip)
5. Integrated Authority File
6. YSO-Wikidata mapping project
7. Environment Ontology
8. UMLS 2023
9. National Library of Israel Names and Subjects Authority File